* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html {
  font-size: 14px;
}
#app {
  width: 100vw;
  height: 100vh;
  font-family: cursive;
  color: #000;
  position: fixed;
  left: 0;
  top: 0;
  background: #e1e1e1;
}

.box-shadow {
  box-shadow: 1px 1px 2px #000, 2px 2px 4px #666, 3px 3px 6px #ccc;
  border-right: 3px solid #999;
  border-bottom: 3px solid #999;
  border-left: 3px solid #fff;
  border-top: 3px solid #fff;
}

.color-blue {
  color: rgb(0, 110, 255);
}